Alopecurus genus --- Grass Family
short-awn foxtail (Alopecurus aequalis) -- in July -- Buffalo Pass Road, Jackson County, CO             green & brown 
Picture
Carolina foxtail (Alopecurus carolinianus) -- in July -- Magpie Meander, Fort Collins Natural Area, Larimer County, CO
meadow foxtail (Alopecurus pratensis) -- in July -- Buffalo Pass Road, Jackson County, CO     green & brown 
Picture
meadow foxtail (Alopecurus pratensis) -- in May -- Red Mountain Open Space, Larimer County, CO